package c5.e8;

public class e8 {
    public static void main(String[] args) {
        System.out.println("1、添加-----------------");
        add();
        System.out.println("2、删除-----------------");
        remove();
        System.out.println("3、修改-----------------");
        alter();
    }
    public  static void add() {
        StringBuffer sb = new StringBuffer();
        sb.append("itcast");
        System.out.println("append添加结果："+sb);
        sb.insert(2,"123");
        System.out.println("insert添加结果："+sb);
    }
    public static void remove(){
        StringBuffer sb = new StringBuffer("itcastcn");
        sb.delete(1,5);
        System.out.println("删除指定位置结果："+sb);
        sb.deleteCharAt(2);
        System.out.println("删除指定位置结果："+sb);
        sb.delete(0,sb.length());
        System.out.println("删除指定位置结果："+sb);
    }
    public static void alter(){
        StringBuffer sb =new StringBuffer("itcastcn");
        sb.setCharAt(1,'p');
        System.out.println("修改指定位置字符结果："+sb);
        sb.replace(1,3,"qq");
        System.out.println("替换指定位置字符（串）结果"+sb);
        System.out.println("字符串反转："+sb.reverse());
    }
}
